CN220707843U - Refrigerator protection structure - Google Patents

Abstract

The application provides a refrigerator protection structure, which comprises a top pad and a plurality of ribs, wherein the top pad is used for being arranged on the top surface of a refrigerator, and a limiting structure is arranged on the top pad; the refrigerator is characterized in that the plurality of protective ribs are respectively arranged at a plurality of side ribs of the refrigerator, any one protective rib is connected with the other protective rib through a connecting rib, the connecting rib is hung on the top pad, and the connecting rib is matched with the limiting structure in a clamping mode. The refrigerator protection structure can solve the technical problem that the protection edges of the existing refrigerator are easy to deviate to cause protection failure.

Description

Refrigerator protection structure

Technical Field

The application relates to the technical field of refrigerator packaging, in particular to a refrigerator protection structure.

Background

In order to prevent the refrigerator from being damaged due to collision with the surrounding environment in the transportation process, the prior proposal is to add a bottom pad on the bottom surface of the refrigerator, add a top pad on the top surface of the refrigerator, add right-angle bending-shaped protective edges at a plurality of side edges of the refrigerator, and finally sleeve the paper box. Therefore, under the obstruction of the top pad, the bottom pad and the protective edges, the refrigerator body cannot directly collide with the surrounding environment, and further the refrigerator is protected.

However, in the prior art, a plurality of ribs are positioned mainly by being clamped between the refrigerator and the outer packing paper box, the assembly is loose, and when larger shaking or the paper box is broken, the ribs are easy to deviate, so that the protection is invalid.

Disclosure of Invention

The embodiment of the application provides a refrigerator protection structure to solve the technical problem that the arris of protecting of current refrigerator takes place the skew easily and leads to the protection inefficacy.

In order to achieve the above purpose, the refrigerator protection structure provided by the application comprises a top pad and a plurality of ribs, wherein the top pad is used for being installed on the top surface of a refrigerator, and a limiting structure is arranged on the top pad; the refrigerator is characterized in that the plurality of protective ribs are respectively arranged at a plurality of side ribs of the refrigerator, any one protective rib is connected with the other protective rib through a connecting rib, the connecting rib is hung on the top pad, and the connecting rib is matched with the limiting structure in a clamping mode.

Optionally, in an embodiment, the limiting structure is a limiting groove with an upward opening, and the connecting edge is clamped in the limiting groove.

Optionally, in an embodiment, the limiting groove extends linearly along a width or length direction of the top pad.

Optionally, in an embodiment, a plurality of notches are provided on a peripheral side of the top pad, and the notches are configured to be disposed corresponding to side edges of the refrigerator; the two ends of the limiting groove are respectively communicated with one notch, the top of the protective edge is positioned in the notch, and the top of the protective edge is connected with the top of the other protective edge through the connecting edge.

Optionally, in an embodiment, the notch has a first inner wall and a second inner wall connected at an included angle; the top of the rib is provided with a top wall, the top wall is connected with the connecting rib, and the top wall is simultaneously abutted with the first inner wall and the second inner wall.

Optionally, in an embodiment, the top pad is further provided with a protective sidewall between two adjacent notches, and the protective sidewall extends downward and is used for being disposed opposite to a side surface of the refrigerator; the rib protection structure comprises a top wall, a rib protection structure and a rib protection structure, wherein the rib protection structure is characterized in that the rib protection structure further comprises a first protection wall and a second protection wall which are connected with each other in an included angle mode, the first protection wall and the second protection wall are connected with the top wall, and the first protection wall and the second protection wall are connected with protection side walls on the same side in an abutting mode.

Optionally, in an embodiment, one of the side wall of the limiting groove and the side wall of the connecting rib is provided with a convex spherical surface, the other side wall is provided with a concave cambered surface adapted to the convex spherical surface, and the convex spherical surface is clamped in the concave cambered surface.

Optionally, in an embodiment, any one of the ribs is further connected to another rib through a plurality of reinforcing arms, and the reinforcing arms are arranged at intervals along the length direction of the rib.

Optionally, in an embodiment, the refrigerator protection structure further includes a bottom pad, where the bottom pad is used to be installed on a bottom surface of the refrigerator, and a limit clamping groove is provided on the bottom pad; the bottom of the guard edge is also provided with a limiting clamp protrusion, and the limiting clamp protrusion is clamped in the limiting clamp groove.

Optionally, in an embodiment, each side edge of the bottom pad is provided with a plurality of limiting clamping grooves, and any one of the limiting clamping grooves can be clamped with the limiting clamping protrusion when corresponding to the limiting clamping protrusion in position.

The refrigerator protection structure that this application provided is through setting up limit structure on the top pad, connects two arriss of protecting through the connection arriss simultaneously, and the connection arriss of wherein articulates on the top pad and cooperates with limit structure joint on the top pad. It can be understood that, because each of the protecting ribs is used for being correspondingly arranged at the side ribs of the refrigerator, the refrigerator body is clamped between any two protecting ribs, and after each protecting rib is connected with the other protecting rib through the connecting rib, the two connected protecting ribs can not approach or separate from each other due to the obstruction of the refrigerator. And because the connecting ribs are hung on the top pad and are matched with the limiting structure on the top pad in a clamping way, the two protecting ribs connected by the connecting ribs cannot outwards deviate at the same time, so that the assembly of the protecting ribs is more stable, and the situation that the protection fails due to deviation is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from the structures shown in these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a schematic view of a refrigerator according to an embodiment of the present application;

FIG. 2 is a schematic view of an embodiment of a refrigerator protection structure according to the present application;

FIG. 3 is a structural exploded view of the refrigerator guard structure of FIG. 2;

FIG. 4 is a schematic view of an embodiment of a top pad of the refrigerator protection structure of the present application;

FIG. 5 is a schematic view of an embodiment of a rib in a refrigerator protection structure according to the present application;

FIG. 6 is a schematic view of an embodiment of a base pad in a refrigerator protection structure according to the present application;

fig. 7 is a schematic structural view of an embodiment of the refrigerator protection structure of the present application when the refrigerator protection structure is packaged outside the refrigerator.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name	Reference numerals	Name of the name
						100	Refrigerator protection structure	20	Edge protector	51	Limiting clamping groove
10	Top pad	21	Top wall	200	Refrigerator with a refrigerator body
						11	Limiting structure	22	First retaining wall	210	Top surface
111	Limiting groove	23	Second retaining wall	220	Bottom surface
						12	Notch	24	Limiting clamp protrusion	230	Side surface
121	A first inner wall	30	Connection edge	240	Side edge
						122	A second inner wall	40	Reinforcing arm
13	Protective side wall	50	Bottom pad

The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The embodiment of the application provides a refrigerator protection structure to solve the problem that the protection edges of a refrigerator are easy to deviate to cause protection failure, and the refrigerator protection structure is described with reference to the accompanying drawings.

First, it should be noted that the refrigerator protection structure 100 is mainly used for packaging protection of the refrigerator 200, as shown in fig. 1, the refrigerator 200 is generally rectangular, and the refrigerator 200 has a top surface 210 and a bottom surface 220 opposite to each other, four side surfaces 230 extending between the top surface 210 and the bottom surface 220, and side edges 240 of the refrigerator 200 between two adjacent side surfaces 230.

In the embodiment of the present application, as shown in fig. 2 and 3, the refrigerator protecting structure 100 includes a top pad 10 and a plurality of protecting ribs 20, and the top pad 10 and the protecting ribs 20 are made of foam, honeycomb cardboard, and other materials having a certain buffering performance. With reference to fig. 1 and 7, the top pad 10 is configured to be mounted on the top surface 210 of the refrigerator 200, and specifically, the top pad 10 has a substantially plate shape so as to cover the top surface 210 of the refrigerator 200. While the peripheral side of the top pad 10 is further formed with a protective sidewall 13 (refer to fig. 4) extending downward, the protective sidewall 13 extends onto the side 230 of the refrigerator 200 when the top pad 10 is placed on the top surface 210 of the refrigerator 200, so that the top pad 10 can cover and protect part or all of the side of the top surface 210 of the refrigerator 200. That is, the top pad 10 may cover the four sides of the top surface 210 of the refrigerator 200 completely, or may cover the four sides of the top surface 210 of the refrigerator 200 together in cooperation with other structures (e.g., the guard rib 20).

The four protecting ribs 20 are provided, and the four protecting ribs 20 are respectively arranged at four side ribs 240 of the refrigerator 200 in a one-to-one correspondence manner, as shown in fig. 5, each protecting rib 20 is in a right-angle bending shape and is provided with a first protecting wall 22 and a second protecting wall 23, and the first protecting wall 22 and the second protecting wall 23 are respectively used for extending at two sides of the side ribs 240 of the refrigerator 200, so that the side ribs 240 of the refrigerator 200 can be protected.

In particular, in the present embodiment, referring to fig. 2 to 5, the top pad 10 is provided with a limiting structure 11, any one of the protecting edges 20 is connected with the other protecting edge 20 through a connecting edge 30, the connecting edge 30 is hung on the top pad 10, and the connecting edge 30 is in clamping fit with the limiting structure 11. Specifically, four guard edges 20 may be grouped in pairs, two adjacent guard edges 20 may be grouped, or two guard edges 20 on a diagonal may be grouped. The two guard edges 20 in each group of guard edges are connected through the connecting edge 30, the connecting edge 30 can be connected and fixed with the guard edges 20 in a clamping or bonding mode, and the guard edges 20 can be integrally formed, so long as the guard edges 20 and the connecting edge 30 can be stably connected.

As will be understood from fig. 7, since each of the ribs 20 is disposed at the side rib 240 of the refrigerator 200, the refrigerator 200 is sandwiched between any two ribs 20, and after each rib 20 is connected to another rib 20 by the connecting rib 30, the two connected ribs 20 cannot approach or separate from each other due to the blocking of the refrigerator 200. For example, as shown in fig. 7, after the packaging is completed, the two protecting ribs 20 on the right side of the refrigerator 200 are connected to the same connecting rib 30, the connecting rib 30 extends along the front-rear direction of the refrigerator 200, and at this time, the two protecting ribs 20 on the right side cannot move forward or backward or move forward and backward respectively due to the connection of the connecting rib 30 and the blocking of the refrigerator 200. Therefore, compared with the prior art that the ribs 20 are positioned only through the refrigerator 200 and the external carton, the positioning stability of the two ribs 20 connected to the connecting rib 30 is higher, and the deviation is less likely to happen.

Further, still please refer to the embodiment after the packaging shown in fig. 7, in order to avoid that two protecting edges 20 move to the right side of the refrigerator 200 along with the connecting edges 30 and separate from the refrigerator 200, as shown in fig. 4, the present application further provides a limiting structure 11 on the top pad 10, where the limiting structure 11 may be a limiting groove 111 or a limiting convex strip, for example, in an embodiment, the limiting structure 11 is a limiting groove 111 with an upward opening, and when assembling, the connecting edges 30 are integrally clamped in the limiting groove 111, so that not only is the connecting edges 30 accurately and rapidly clamped on the top pad 10 by a packaging person, but also the connecting edges 30 do not protrude upward to the top pad 10, and the packaged height of the refrigerator 200 is ensured not to be excessively high. Of course, the limiting structure 11 may also be a limiting convex strip, and at this time, the connecting edge 30 may be correspondingly provided with a limiting groove, so that the clamping fit between the connecting edge 30 and the limiting structure 11 may also be realized. Or, the limit structure 11 is provided with a limit groove and a limit convex strip at the same time, and the connection edge 30 is also provided with a corresponding limit bulge and a corresponding limit groove at the same time, so that the limit structure 11 and the connection edge 30 are clamped and matched in a mutual inserting mode. In summary, the clamping manner of the connecting rib 30 and the limiting structure 11 can be flexibly set according to practical situations, so long as the top pad 10 can limit the connecting rib 30 and the protecting rib 20 to move outside the side wall of the packaging box after the connecting rib 30 and the limiting structure 11 are clamped with each other.

It can be appreciated that, because the connecting rib 30 is hung on the top pad 10 and is engaged with the limiting structure 11 on the top pad 10, the two protecting ribs 20 connected by the connecting rib 30 cannot be deflected outwards together, that is, the two protecting ribs 20 on the right side of the refrigerator 200 cannot move rightwards together with the connected connecting rib 30, and the two protecting ribs 20 on the left side of the refrigerator 200 cannot move leftwards together with the connected connecting rib 30, so that the assembly of the protecting ribs 20 is more stable, and the situation of protection failure caused by deflection is avoided.

Optionally, in an embodiment, as shown in fig. 4, the limiting structure 11 on the top pad 10 is a limiting groove 111, and the limiting groove 111 extends linearly along the width or length direction of the top pad 10, that is, two adjacent protecting edges 20 are a group and connected by a connecting edge 30, and the connecting edge 30 also extends linearly and is adapted to be clamped in the limiting groove 111. It will be appreciated that this not only simplifies the structure of the retaining groove 111 and the connecting rib 30, thereby reducing the difficulty and cost of processing, but also facilitates the packaging personnel to hang the connecting rib 30 onto the top pad 10.

Of course, the limiting groove 111 may be provided in other extending forms according to practical situations, for example, the limiting groove 111 may extend in a right angle bending manner, may extend in a wave shape, or the like.

Alternatively, in one embodiment, as shown in fig. 4, the peripheral side of the top pad 10 is provided with a plurality of notches 12, the notches 12 being configured to correspond to the side edges 240 of the refrigerator 200, and in particular, as will be understood in conjunction with fig. 1 and 7, the refrigerator 200 has four side edges 240, so that the peripheral side of the top pad 10 is also provided with four notches 12, and each notch 12 corresponds above one side edge 240 when the top pad 10 is mounted to the refrigerator 200. On the basis that the top pad 10 is provided with a plurality of notches 12, two ends of the limiting groove 111 are respectively communicated with one notch 12, namely four notches 12 are also in groups, and two notches 12 in each group of notches 12 are communicated through the limiting groove 111. The top of the guard rib 20 is located in the notch 12, and the top of the guard rib 20 is connected with the top of another guard rib 20 through the connecting rib 30, it can be understood that the arrangement is such that the top of the guard rib 20 can be contained in the notch 12, so as to avoid the protrusion of the guard rib 20 relative to the top pad 10, and further avoid the situation that the width or length of the packaged refrigerator 200 is too large.

Further, as shown in fig. 4, the notch 12 has a first inner wall 121 and a second inner wall 122 connected at an included angle, as shown in fig. 5, a top wall 21 is formed at the top of the rib 20, the top wall 21 is connected with the connecting rib 30, and as shown in fig. 2, the top wall 21 is simultaneously abutted against the first inner wall 121 and the second inner wall 122, and further the top wall 21 of the rib 20 can be mutually matched with the top pad 10, so as to completely cover the top surface 210 of the refrigerator 200, and the top walls 21 can jointly limit the top pad 10, so as to avoid left-right or front-back shaking of the top pad 10.

Optionally, in an embodiment, as shown in fig. 4, the top pad 10 is further provided with protective side walls 13 between two adjacent notches 12, each protective side wall 13 extending downward and being configured to be disposed opposite to a side 230 of the refrigerator 200, and each protective side wall 13 extends to the side 230 of the refrigerator 200 when the top pad 10 is mounted to the top surface 210 of the refrigerator 200, thereby covering and protecting a portion of the side edge of the top surface 210 of the refrigerator 200. Meanwhile, as shown in fig. 5, the rib 20 further includes a first protection wall 22 and a second protection wall 23 connected at an included angle, where the first protection wall 22 and the second protection wall 23 are connected with the top wall 21, and as shown in fig. 2, the first protection wall 22 and the second protection wall 23 are abutted with the protection side wall 13 on the same side. For example, two first protection walls 22 located at the front side of the refrigerator 200 are respectively abutted against both sides of the protection side wall 13 located at the front side of the refrigerator 200, and two second protection walls 23 located at the right side of the refrigerator 200 are respectively abutted against both sides of the protection side wall 13 located at the right side of the refrigerator 200. It can be appreciated that this can enable the protective rib 20 and the top pad 10 to jointly cover each side of the top surface 210 of the refrigerator 200 on the basis that the protective rib 20 does not protrude from the side surface 230 of the top pad 10, thereby achieving effective protection of the refrigerator 200.

Optionally, in an embodiment, one of the side wall of the limiting groove 111 and the side wall of the connecting rib 30 is provided with a convex spherical surface (not shown), and the other is provided with a concave cambered surface (not shown) adapted to the convex spherical surface, and the convex spherical surface is clamped in the concave cambered surface. Specifically, a semicircular convex spherical surface is provided on the side wall of the limiting groove 111, and a semicircular concave cambered surface is provided on the connecting edge 30, so that when the connecting edge 30 is clamped and installed in the limiting groove 111, the convex spherical surface is correspondingly clamped and connected in the concave cambered surface. It can be understood that the arrangement of the connecting rib 30 does not affect the loading or unloading of the limiting groove 111, and can also generate a certain limiting effect on the connecting rib 30 through the cooperation of the convex spherical surface and the concave cambered surface when the connecting rib 30 is installed in the limiting groove 111, so that the connecting rib 30 is prevented from automatically moving upwards and separating from the limiting groove 111, and the installation stability of the protecting rib 20 is ensured. It should be noted that, the convex spherical surface and the concave cambered surface may be respectively provided with a plurality of convex spherical surfaces and concave cambered surfaces, and the convex spherical surfaces and the concave cambered surfaces may be arranged at intervals along the length direction of the limiting groove 111 or the connecting rib 30, so that the installation stability of the protecting rib 20 may be further improved.

Optionally, in an embodiment, as shown in fig. 5, any one of the ribs 20 is further connected to another rib 20 by a plurality of reinforcing arms 40, and the reinforcing arms 40 are arranged at intervals along the length direction of the rib 20. Specifically, in the present embodiment, a plurality of reinforcing arms 40 are further connected between two guard ribs 20 connected to the same connecting rib 30, and the plurality of reinforcing arms 40 are integrally formed with the two connected guard ribs 20 and are arranged at intervals along the length direction of the connected guard ribs 20. It will be appreciated that this arrangement enhances the strength of the connection between the two ribs 20, making the mutual restriction between the two ribs 20 more effective.

Optionally, in an embodiment, referring to fig. 5 and fig. 6, the refrigerator protection structure 100 further includes a bottom pad 50, the bottom pad 50 is used for being installed on a bottom surface 220 of the refrigerator 200, a limiting slot 51 with an upward slot is provided on the bottom pad 50, a limiting protrusion 24 is further provided on a bottom of the guard rib 20, and when the guard rib 20 is connected to the top pad 10, the limiting protrusion 24 on the bottom of the guard rib 20 is clamped in the limiting slot 51. That is, the edge 20 is not only clamped with the top pad 10 by the connecting edge 30, but also clamped with the bottom pad 50 by the limiting clamping protrusions 24, and further, two sides of the edge 20 in the length direction are clamped and matched with the top pad 10 and the bottom pad 50, so that the positioning stability of the edge 20 is better, and even if no external carton exists, the edge 20, the top pad 10 and the bottom pad 50 can be stably positioned, and further, effective protection of the refrigerator 200 is maintained.

Optionally, in an embodiment, as shown in fig. 6, each side edge of the base pad 50 is provided with a plurality of limiting clamping grooves 51, and any one of the limiting clamping grooves 51 can be clamped with the limiting clamping protrusion 24 when corresponding to the limiting clamping protrusion 24 in position. Specifically, each side edge of the bottom pad 50 is provided with two limiting clamping grooves 51 for clamping the two limiting clamping protrusions 24 on the two guard edges 20. In the assembled embodiment shown in fig. 2, the bottom pad 50 is clamped by the limiting clamping grooves 51 on the front side and the rear side and the limiting clamping protrusions 24, and the limiting clamping grooves 51 on the left side and the right side are arranged in an idle mode; if the refrigerator 200 rotates 90 ° together with the guard rib 20 hung on the refrigerator 200, the limit clamping grooves 51 on the left and right sides of the bottom pad 50 are clamped with the limit clamping protrusions 24, and the limit clamping grooves 51 on the front and rear sides are arranged at intervals. It can be appreciated that, by arranging the plurality of limiting slots 51 on each side edge of the bottom pad 50, the bottom pad 50 can be placed on the bottom surface 220 of the refrigerator 200 at any angle, or the refrigerator 200 and the protecting ribs 20 hung on the refrigerator 200 can be placed on the bottom pad 50 at any angle, so that the situation that the bottom pad needs to be readjusted due to the fact that the angle is not aligned is avoided, and the packaging efficiency is ensured.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments. In the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features.

The refrigerator protection structure provided by the embodiment of the present application is described in detail, and specific examples are applied to illustrate the principles and embodiments of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the contents of the present specification should not be construed as limiting the present application in summary.

Claims (10)

1. A refrigerator protecting structure, comprising:

the top pad is used for being arranged on the top surface of the refrigerator, and a limiting structure is arranged on the top pad; the method comprises the steps of,

the refrigerator comprises a plurality of protective edges, wherein the protective edges are respectively arranged at a plurality of side edges of the refrigerator, any one of the protective edges is connected with the other protective edge through a connecting edge, the connecting edge is hung on the top pad, and the connecting edge is matched with the limiting structure in a clamping manner.

2. The refrigerator protecting structure according to claim 1, wherein the limiting structure is a limiting groove with an upward opening, and the connecting edge is clamped in the limiting groove.

3. The refrigerator protecting structure of claim 2, wherein the limit groove extends in a straight line along a width or length direction of the top pad.

4. The refrigerator protecting structure of claim 3, wherein a plurality of notches are formed on the peripheral side of the top pad, and the notches are used for being arranged corresponding to the side edges of the refrigerator;

the two ends of the limiting groove are respectively communicated with one notch, the top of the protective edge is positioned in the notch, and the top of the protective edge is connected with the top of the other protective edge through the connecting edge.

5. The refrigerator guard structure of claim 4, wherein the notch has a first inner wall and a second inner wall connected at an included angle;

the top of the rib is provided with a top wall, the top wall is connected with the connecting rib, and the top wall is simultaneously abutted with the first inner wall and the second inner wall.

6. The refrigerator protecting structure of claim 5, wherein the top pad is further provided with a protecting side wall between two adjacent notches, the protecting side wall extending downwards and being used for being arranged opposite to the side face of the refrigerator;

the rib protection structure comprises a top wall, a rib protection structure and a rib protection structure, wherein the rib protection structure is characterized in that the rib protection structure further comprises a first protection wall and a second protection wall which are connected with each other in an included angle mode, the first protection wall and the second protection wall are connected with the top wall, and the first protection wall and the second protection wall are connected with protection side walls on the same side in an abutting mode.

7. The refrigerator protecting structure of any one of claims 2 to 6, wherein one of the side walls of the limit groove and the side walls of the connecting ribs is provided with a convex spherical surface, the other is provided with a concave cambered surface matched with the convex spherical surface, and the convex spherical surface is clamped in the concave cambered surface.

8. The refrigerator protecting structure of any one of claims 1 to 6, wherein any one of the ribs is further connected to another rib by a plurality of reinforcing arms, and the reinforcing arms are arranged at intervals along the length direction of the rib.

9. The refrigerator protecting structure according to any one of claims 1 to 6, further comprising a bottom pad for being mounted on the bottom surface of the refrigerator, wherein the bottom pad is provided with a limit clamping groove; the bottom of the guard edge is also provided with a limiting clamp protrusion, and the limiting clamp protrusion is clamped in the limiting clamp groove.

10. The refrigerator protecting structure of claim 9, wherein each side edge of the base pad is provided with a plurality of limit clamping grooves, and any one of the limit clamping grooves can be clamped with the limit clamping protrusion when corresponding to the limit clamping protrusion in position.